William p



(NoMode li) W. E. BARNES.

DRILLING MACHINE. No. 549,559. Patented Nov. 12,1995.

AN DREW BER/MAM. PHOTOUTHQWASHI NG'TUN 5.6

- ing from the base portion of the drill.

UNITED STATES IVILLIAM BARNES, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THE \V. F.

JOHN BARNES COMPANY, OF SAME PLACE.

PATENT OFFICE.

DRILLING-MACHINE.

SPECIFICATION forming part of Iletters Paar ive. 549,559, dated November 12, 1895.

Application filed March 17, 1891. Serial No. 386,883. (No model.)

To (ZZZ whom it may concern:

Be it known that I, WVILLIAM F. BARNES, a citizen of the United States, residing at Rockford, in the countyof W'innebago and State of Illinois, have invented certain new and use ful Improvementsin Drilling-Machines, of which the following is a specification.

The object of this invention is to furnish means for counterbalancing the weight of the drill-spindle, which consists of a friction-contact between the main supporting-frame and drill-spindle.

In theaceompanying drawings, Figure 1 is a side elevation, with the lower portion in section, of a drilling-machine embodying my invention. Fig. 2 is'a sectional view showing a face view of the friction-disk and the means employed for moving the friction-wheel across the face. verse section showing the upper face of the friction-wheel. Fig. 4 is 'a vertical section of the friction device for counterbalancing the weight of the drill-spindle. Fig. 5 is a face view of the outer disk of the drill-spindle friction device.

The drill represented in the drawings consists of a hollow base 1, composing a hollow column 2, provided with'drill-spindle guides 3, in which moves a drill-spindle 4 of the usual construction.

The platen 5 herein represented may be of any of the known constructions capable of a vertical'sliding engagement with the column.

A horizontal shaft 14 has a pulley 15 keyed or set-screwed thereto and revolves in bearings supported by the base of the drill. This pulley has a belt connection with the lineshafting. The bearing 16 is held by set-screws 17, passing through the frame in such a manher as to permit a slight vertical oscillation. The bearing 18 is held centrally within a pivoted arm 19, having a central depending socket, through which the bearing passes and in which it is held by set-screw 20, which permits a slight horizontal oscillation. One end of this bearing is open, while its other end is screwthreaded, and into which is turned a thumb screw 21. A jam nut 22 serves to hold the screw when adjusted. This arm 19 has a pivotal connection with an arm 23, ris- The Fig. 3 is a partial plan and transother end has an elongated slot 24, in which is placed an eccentric 25, having an arm 26 projecting horizontally from its upper face. The free end of this arm 26 is connected by a rod 28 to a kick-lever 27, pivoted to the base of the drill, as shown at Fig. 3. Upon the inner end of the shaft 14 is secured a frictiondisk 29, which is located within the hollow base ofthe drill.

A vertical shaft 30 has its lower end resting in a socket 31, held in place by a cross-arm 32, cast integral with the base portion of the drill. This shaft extends vertically through the central opening of the drill-column and projects sufficiently from the top to receive a pulley 33. The lower portion of this shaft is grooved and receivesa feather 34, which connects' the friction-wheel with the shaft. The friction wheel has its face of elastic material and revolves in contact with the face of the friction-disk 29. The hub portion of the wheel has a central collar 36, so fitted that the wheel can revolve independent of the collar. A vertical rod 37 has its lower end connected with this collar and extends upward within the column of the drill. Its upper end is bent and extends laterally through an elongated opening 38 in the side of the upper portion of the drill, and a clamping-lever 39 has a screw-threaded connection therewith. By means of this lever the frictionwheel can be raised or lowered, and the rapidity of its revolutions will depend upon how far it is from the center of the frictiondisk. hen the wheel is in contact with the disk 011 its upper half, the wheel will be revolved, and when below the center will revolve in the opposite direction, and by means of this lever 39 the wheel can be held in any adjustment within the length of the slot 38 by turning it up until the friction is sufficient to hold it.

The pulley 33 on the upper end of the shaft 30 has a belt connection with a pulley 40, which has a feather connection with the drillspindle 4, thereby permitting the raising and lowering of the spindle. This spindle is of the usual form, and has a rack 42, which is raised and lowered by a toothed wheel 43 within the hollow overhanging arms 44 of the upper portion of the drill.

I have deviseda friction device for holding the drill spindle at any desired elevation within its range, and which consists of a shaft 45, connected with the toothed wheel, 43 to revolve therewith. This shaft extends through an arm 46 on the side of the overhanging arm and has its projecting end screwthreaded. This arm has its outer end 47 in disk form. A disk 48 has a feather connection with the shaft 45. This disk in this instance has three radial holes 49 in its periphery, and into which a hand-lever 50 may be inserted for the purpose of turning it. At suitable intervals transverse openings 51 are formed through the disk 48, a spring 52 is inserted therein, and an adj ustin g-screw 53 is screw-threaded therein. These springs press against the face of the arm 46, and by means of the screws 53 their tension may be varied to press with more or less force. A collar 54 on the shaft 45 holds the shaft from moving cndwise and keeps the toothed wheel 43 in place with respect to the toothed rack. By means of this friction connection I am able to do away with all counterbalancing-weights heretofore employed, and as the spindle is taised or lowered it will stand in any posirion, and by the adjustable springs it can be made to move with more or less force, as required.

By means of the kick-lever and its connection with the eccentric the operator can move the eccentric so as to move the bearing 18 rearward, thereby allowing the shaft with the friction-disk attached to also move rearward, which movement will disengage the disk from its contact with the friction-wheel, thereby stopping the rotation of the wheel, and consequently the rotation of the drill-spindle, and when it is desired to start the spindle the operator can move the disk until it is in fric tional contact with the wheel. By means of the adjusting-screw 21 the friction between the disk and wheel maybe regulated. By locating the frictional driving mechanism in the hollow base portion of the drill-frame it is protected from all outside influences, but can be got at when required through an open ing which is closed by a door.

It is evident that the shaft 30 may extend exterior of the column, and instead of its belt connection with the drill-spindle other means may be employed without departing from the gist of my invention.

I claim as my invention 1. In a drilling machine, the combination of a drill spindle, and friction mechanism for counterbalaneing the weight of the spindle, consisting of a stationary disk, a disk connected to the operating shaft of the spindle, and a spring or other yielding material having a connection with one of said disks and exerting its influence upon the other disk.

2. In a drilling machine, the combination of a drill spindle provided with a toothed rack, a toothed pinion engaging the teeth of the rack, an operating handle for the pinion and friction mechanism between the handle and pinion for counterbalanein g the weight of the spindle.

VILLIAM F. BARNES.

\Yitnesses:

O. XV. BROWN, D. S. HoUeH. 

